html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  display: flex;
  background-color: #000;
}

button {
  margin: auto;
  padding: 20px 50px;
  background: none;
  border-radius: 5px;
  outline: none;
  border: 1px solid #000;
  position: relative;
  overflow: hidden;
  span {
    position: relative;
    z-index: 3;
    color: yellowgreen;
  }
  &::after {
    content: "";
    position: absolute;
    left: calc(50% - 25px);
    top: 50%;
    width: 50px;
    height: 150px;
    background-color: orange;
    z-index: 1;
    transform-origin: 50% 0;
    animation: move 3s linear infinite;
  }
  &::before {
    content: "";
    position: absolute;
    width: calc(100% - 4px);
    height: calc(100% - 4px);
    left: 2px;
    top: 2px;
    background-color: #000;
    border-radius: 5px;
    z-index: 2;
  }
}

@keyframes move {
  0% {
    transform: rotate(0);
  }
  100% {
    transform: rotate(360deg);
  }
}
